Chest trauma on the water

Beacon Medical Preparedness | Week 3

Why Boaters Need Chest Seals

The $20 first aid kit from Amazon won't save someone with a sucking chest wound. Here's what will—and why most boaters are dangerously unprepared.

The water changes everything. When a boating accident happens, you're not just dealing with the injury—you're dealing with the environment. Waves rock the vessel. The engine might still be running. Help is hours away, not minutes. And if someone has a hole in their chest, every breath they take is sucking air into places it doesn't belong. You have seconds to act. The right equipment in your hands means life. The wrong equipment—or none at all—means death.

In 2024, the U.S. Coast Guard recorded 3,887 recreational boating accidents resulting in 556 deaths and 2,170 injuries. Among those incidents were 169 propeller strikes—events that don't just cause lacerations, but often cause penetrating chest trauma. When a spinning propeller meets human flesh, the result is catastrophic.

Figure 1: U.S. Recreational Boating Statistics (2024) — Source: U.S. Coast Guard

Most boaters carry first aid kits. But here's the uncomfortable truth: Most marine first aid kits are woefully inadequate for the injuries that actually happen on the water. They have bandages for cuts, aspirin for headaches, and maybe some seasickness tablets. What they don't have—and what can mean the difference between life and death—is a chest seal.

Understanding Sucking Chest Wounds

A sucking chest wound—medically called an open pneumothorax—occurs when a penetrating injury creates a hole in the chest wall. This hole allows air to enter the pleural space (the area between the lung and chest wall) directly from the outside, rather than through the trachea and bronchi as nature intended.

The result is a collapsed lung. But it's worse than that. The physics of breathing work against the patient:

• During inhalation: The chest expands, creating negative pressure. Air follows the path of least resistance—through the hole in the chest, not through the airway. The lung can't inflate.
• During exhalation: Air may exit through the wound, creating the characteristic "sucking" sound that gives this injury its name.
• The mediastinum shifts: With each breath, pressure changes cause the heart and major blood vessels to move back and forth. This compromises cardiac function.

Without intervention, an open pneumothorax can progress to a tension pneumothorax—a condition where air becomes trapped in the pleural space under pressure, compressing the lung and shifting the mediastinum to the point where the heart can't fill with blood. This is immediately life-threatening.

Signs and Symptoms of a Sucking Chest Wound

Sign/Symptom	What to Look For
Sucking or hissing sound	Audible air movement through the wound, especially during breathing
Bubbling blood	Blood that bubbles or froths at the wound site
Severe dyspnea	Difficulty breathing, rapid shallow breaths, gasping
Cyanosis	Blue or gray lips, fingertips, or skin from oxygen deprivation
Asymmetrical chest movement	One side of chest not rising/falling with breaths
Tachycardia	Rapid heart rate as the body tries to compensate
Tension pneumothorax signs	Tracheal deviation, distended neck veins, worsening distress

The Chest Seal: How It Works

A chest seal is a specialized occlusive dressing designed to cover open chest wounds. Unlike regular dressings, chest seals are engineered to address the unique physiology of chest trauma. The Beacon Pro includes two vented chest seals in its Trauma Pouch—and there's a reason for both the vented design and the quantity.

Vented vs. Non-Vented Chest Seals

Research published in the Journal of Trauma and Acute Care Surgery compared vented and unvented chest seals in a swine model of pneumothorax. The findings were clear:

• Both types provided immediate improvement in breathing and blood oxygenation.
• However, with ongoing air accumulation, unvented seals led to tension pneumothorax in all subjects after approximately 1.4 liters of air injection.
• Vented seals prevented tension pneumothorax by allowing trapped air to escape while blocking outside air from entering.

The takeaway: Vented chest seals are superior for prehospital care because they account for the unpredictable nature of trauma. You don't know if the lung is still leaking air. A vented seal protects against the worst-case scenario.

Figure 2: Chest Seal Application Field Guide — Screenshot this for your boat

Step-by-Step: Applying a Chest Seal

When you discover a penetrating chest wound, speed matters. Here's the protocol:

Step 1: Scene Safety

• Stop the vessel or get to stable ground
• Kill the engine—propeller strikes often involve ongoing danger
• Don gloves from your kit—bloodborne pathogens are real

Step 2: Expose the Wound

• Cut clothing away with trauma shears—don't waste time removing it normally
• Check for entry and exit wounds—bullets and impalements can go through
• Wipe blood from the skin around the wound so the seal will adhere

Step 3: Cover Immediately

• Place your gloved hand over the wound while preparing the seal
• Every breath without coverage is air entering the pleural space
• If you have nothing else, use the palm of your hand—it's better than nothing

Step 4: Apply the Chest Seal

• Peel the backing from the seal
• Center the vented valve directly over the wound
• Press firmly from the center outward, ensuring complete adhesion
• Check that the seal rises and falls with the patient's breaths

Step 5: Monitor for Tension Pneumothorax

Even with a vented seal, complications can occur. Watch for:

• Worsening shortness of breath
• Tracheal deviation (the windpipe shifts away from the injury)
• Distended neck veins
• Decreasing level of consciousness

If tension pneumothorax signs appear: Lift one edge of the seal to "burp" trapped air, then reseal. This is why vented seals are critical—they're designed to prevent this scenario.

The Exit Wound Problem

Penetrating trauma often has both an entry and exit wound. If you seal the entry but not the exit, air can still enter the pleural space. This is why the Beacon Pro includes two chest seals. One for the front, one for the back. Check everywhere—chest, back, sides. On a boat, people fall against equipment, get hit by loose gear, or are struck by propellers that can cause multiple wounds.

Marine-Specific Complications

Treating chest trauma on the water introduces challenges you won't find in a classroom:

The Movement Factor

Waves cause constant motion. A seal that adheres perfectly at the dock may peel at the edges when the boat rocks. Press the seal firmly for a full 30 seconds. Consider using tape around the edges if conditions are rough.

Wet Everything

Saltwater and blood create a slippery film that prevents adhesion. Dry the skin as much as possible before application. The Beacon Pro's chest seals are designed with aggressive adhesive for exactly this scenario—but they still need a reasonably dry surface.

Extended Transport Times

On land, EMS might arrive in 8-15 minutes. On the water, you're looking at 30 minutes to hours. The patient needs continuous monitoring. The seal may need to be replaced if it becomes saturated with blood or loses adhesion. This is why you need multiple seals in your kit.

Hypothermia

Cold water accelerates heat loss. A patient with chest trauma who's also hypothermic has a compounded problem. The Beacon Pro includes emergency blankets, but in a chest trauma scenario, your priority is the airway and the seal. Address hypothermia once the immediate life threat is controlled.

KIT CHECK: The Beacon Pro Chest Trauma Capability

CHEST SEALS (2x vented): Professional-grade vented seals with one-way valve technology. Research-proven to prevent tension pneumothorax. Two included because entry and exit wounds both need coverage.

TRAUMA SHEARS: Cut clothing, seatbelts, or gear to expose the wound. Blunt-tip design won't cause additional injury.

NITRILE GLOVES (2 pairs): Protection from bloodborne pathogens. Blood on your hands compromises your ability to help others.

EMERGENCY BLANKETS: Address hypothermia once immediate threats are controlled.

WHAT CHEAP KITS DON'T HAVE: That $20 Amazon kit? It has bandages. It doesn't have chest seals because chest seals cost money. The manufacturer saved $15. Your crew member might pay with their life.

SKILL TO PRACTICE: Time yourself: gloves on, shears out, clothing cut, seal applied. Under 60 seconds is your goal. On the water, waves won't wait for you to figure it out.

Improvising When You Must

If you don't have a commercial chest seal, you can improvise—but understand the limitations. The classic field improvisation is a three-sided occlusive dressing:

1. Use any airtight material: plastic wrap, aluminum foil, the bag from your emergency blanket
2. Cut it larger than the wound—at least 2 inches of overlap on all sides
3. Tape three sides down firmly, leaving the fourth side open as a flutter valve
4. The open side should be at the bottom to allow drainage

This works, but it's inferior to a commercial vented seal. The flutter valve may not function properly. The adhesion won't be as secure. And you'll need to monitor constantly for signs of tension pneumothorax. Improvise if you must, but carry the real thing.

The Practice Challenge

Reading this article is not training. You need muscle memory. Here's your homework:

1. Kit familiarization: Open your Beacon Pro. Locate the chest seals. Know where they are blindfolded.
2. Timing drill: With a partner, time yourself from "injury discovered" to "seal applied." Under 60 seconds on a stable surface. Under 90 seconds on a rocking boat.
3. Two-seal scenario: Practice applying seals to both entry and exit wounds. The second seal is often forgotten in the stress of the moment.
4. Improvisation practice: Try making a three-sided dressing from materials on your boat. Know what works before you need it.

The goal is unconscious competence. When your buddy has a hole in their chest, you don't want to be thinking. You want to be acting.

Sources & References

U.S. Coast Guard. "Recreational Boating Statistics 2024." https://www.uscgboating.org/library/accident-statistics/

Kheirabadi, B.S., et al. "Vented versus unvented chest seals for treatment of pneumothorax and prevention of tension pneumothorax in a swine model." Journal of Trauma and Acute Care Surgery, 2013.

National Center for Biotechnology Information. "Tension Pneumothorax - StatPearls." https://www.ncbi.nlm.nih.gov/books/NBK559090/

Cleveland Clinic. "Pneumothorax (Collapsed Lung): Symptoms & Treatment." https://my.clevelandclinic.org

Verywell Health. "How Chest Seals Save Lives in Emergencies." https://www.verywellhealth.com

EMS1. "Tension pneumothorax: Needle decompression steps." https://www.ems1.com

Boating Magazine. "US Coast Guard Recreational Boating Statistics." https://boatingmag.com

Beacon Medical Preparedness | beaconmedprep.com

Medical Disclaimer: This article is for educational purposes only and does not constitute medical advice. Seek professional medical training and consult with healthcare providers for guidance specific to your situation.